Pictures borrowed from the internet. I'll put them back after you've seen them.
Looks like a Speed P8, I have one and have packed it in a standard sized Samsonite Oyster hard shell the same way. IIRC, the dealer did mention that this was one of the unique Dahons where you could fold the fork into the rear triangle which allow a flat frame position without disassembly. Just remove pedals (I have MKS QR), seat tube, handlebar stem, and wheels. No tools, but I have to let the air out of the BA tires to close the lid.